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Accumulated Other Comprehensive Income (Tables) | 12 Months Ended
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May. 31, 2015
Equity [Abstract] |
Changes in accumulated other comprehensive income | The changes in accumulated other comprehensive income are as follows:
|  | Year ended May 31,
In millions |  | 2015 |  | 2014 |  | 2013
Beginning balance |  | $ | 21.5 |  |  | $ | 22.0 |  |  | $ | 37.7 |
Other comprehensive loss: |  |  |  |  |  |
Unrealized holding (losses)/gains |  | (21.5 | ) |  | 0.3 |  |  | (24.1 | )
Income tax benefit/(expense) related to unrealized holding gains/(losses) |  | 7.7 |  |  | (0.4 | ) |  | 9.0 |
Reclassification adjustment for the net gain on sale of available-for-sale securities realized in net income |  | (0.3 | ) |  | (0.6 | ) |  | (0.9 | )
Income tax expense on reclassification adjustment for the net gain on sale of available-for-sale securities |  | 0.1 |  |  | 0.2 |  |  | 0.3 |
Total other comprehensive loss, net of tax |  | (14.0 | ) |  | (0.5 | ) |  | (15.7 | )
Ending balance |  | $ | 7.5 |  |  | $ | 21.5 |  |  | $ | 22.0 |
Total tax (benefit)/expense included in other comprehensive loss |  | $ | (7.8 | ) |  | $ | 0.2 |  |  | $ | (9.3 | )

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580 + Details
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